This page calculates the average heat transfer coefficient and heat convected from an isothermal (constant temperature) circular rod at a specified temperature in free stream flow.

Define the rod size, surface temperature, ambient air fluid temperature and approach flow speed. You also need to define the fluid properties. This page will calculate a heat transfer coefficient based on the flow conditions as well as the heat transfer by convection from the isothermal circular rod.

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Rod and Flow Conditions

Description Symbol Value Units
Rod Diameter D Meters
Rod Length (perpendicular to flow) L Meters
Rod Temperature Tr oC
Ambient Temperature Ta oC
Flow Velocity um m/s

Fluid Properties at Film Temperature (Default is for Air at 20C)

Description Symbol Value Units
Film Temperature = (Tr+Ta)/2 Tf oC
Conductivity k W/m-oC
Kinematic Viscosity v m2/s
Thermal Diffusivity a m2/s

Results for Isothermal Rod

Description Symbol Value Units
Prandtl Number = v/a Pr None
Reynolds Number = um*D/v Re None
Nusselt Number = Nu None
Heat Transfer Coefficient = Nu*k/D h W/m2-C
Heat Dissipated from Rod = h*pi*D*L*(Tr-Ta) q W

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